As long as you wire them correctly your inverter/converter/electrical system won't know the difference. Just bear in mind with the same converter that it might take longer to recharge them, as you will likely be increasing the available amperage/battery capacity. I've been running dual Trojan T105s for years, they "take a lickin' and keep on tickin'". Mine are wet/flooded batteries, of course AGMs are very nice (but pricey).
1999 28' Safari
2012 F150 Platinum Max Tow 7650 GVWR 3.73 Elec. Locking Diff.(Prev 2003 Dmax).
Honda EU2000i, Equalizer Hitch
AM Solar Panels 150W - 2 Trojan T 105 6V Batteries
On internet forums, please research and separate the wheat from the chaff (including mine!)